How many grams is a full cart?
The 1 gram cart will hold 1.25g of oil. If you look at the website they will explain the reasoning behind this, the extra space allows for expansion of the heated product and prevents leakage.
Good vape mod for full gram cartridge
Yocan UNI Pro is a good battery with 22 voltage settings, 2.0 all the way to 4.2v. you can also adjust the cartridge height to make them fit full and half grams.